Title: The Mobility and Plant Availability of Boron in Selected Western Oregon Abstract approved: Redacted for Privacy

Several crops grown in the Willamette valley of western Oregon respond to applications of boron fertilizers. The acid, highly-leached soils of this area are naturally low in plant-available B. Application of B to the soil annually or at less frequent intervals is currently recommended, but the fate of applied B and the residual effect on plant growth has received little attention. In studying boron in these soils a more convenient and more accu-rate method for determining hot-water-soluble B based on the azomethine-H procedure was developed and adopted to replace the curcumin method